The authors have compiled this glossary of terms used in the text which may be unfamiliar to the casual reader, or that may have applied connotation in horticulture not immediately apparent to those outside the field.

Acid Soil – soil with a low pH value, less than 7

Alkaline Soil – soil with a high pH value, greater than 7

Alternate – leaves that are arranged singly along a twig, not in pairs

Bark – the outer covering of a tree trunk and branches

Bisexual – a plant that creates flowers with both male and female organs in the same flower

Bract – a modified or scale-like leaf usually found at the base of a fruit or flower